DNA-directed RNA polymerase III subunit RPC1 / DNA-directed RNA polymerases I and III subunit RPAC1 / TATA-box-binding protein / DNA-directed RNA polymerase III subunit RPC7 / DNA-directed RNA polymerases I, II, and III subunit RPABC1 / DNA-directed RNA polymerases I, II, and III subunit RPABC2 / DNA-directed RNA polymerases I, II, and III subunit RPABC3 / DNA-directed RNA polymerases I, II, and III subunit RPABC5 / DNA-directed RNA polymerase III subunit RPC2 / DNA-directed RNA polymerase III subunit RPC4 ...DNA-directed RNA polymerase III subunit RPC1 / DNA-directed RNA polymerases I and III subunit RPAC1 / TATA-box-binding protein / DNA-directed RNA polymerase III subunit RPC7 / DNA-directed RNA polymerases I, II, and III subunit RPABC1 / DNA-directed RNA polymerases I, II, and III subunit RPABC2 / DNA-directed RNA polymerases I, II, and III subunit RPABC3 / DNA-directed RNA polymerases I, II, and III subunit RPABC5 / DNA-directed RNA polymerase III subunit RPC2 / DNA-directed RNA polymerase III subunit RPC4 / DNA-directed RNA polymerases I and III subunit RPAC2 / Transcription factor IIIB 70 kDa subunit / DNA-directed RNA polymerase III subunit RPC3 / DNA-directed RNA polymerase III subunit RPC6 / DNA-directed RNA polymerase III subunit RPC8 / DNA-directed RNA polymerase III subunit RPC5 / DNA-directed RNA polymerases I, II, and III subunit RPABC4 / Transcription factor TFIIIB component B'' / DNA-directed RNA polymerase III subunit RPC9 / DNA-directed RNA polymerase III subunit RPC10 類似検索 - 構成要素
Biotechnology and Biological Sciences Research Council
BB/K014390/1
英国
Cancer Research UK Programme Foundation
CR-UK C47547/A21536
英国
Wellcome Trust
200818/Z/16/Z
英国
Marie Sklodowska-Curie Intra-European Fellowship
655238
英国
引用
ジャーナル: Nature / 年: 2018 タイトル: Structural basis of RNA polymerase III transcription initiation. 著者: Guillermo Abascal-Palacios / Ewan Phillip Ramsay / Fabienne Beuron / Edward Morris / Alessandro Vannini / 要旨: RNA polymerase (Pol) III transcribes essential non-coding RNAs, including the entire pool of transfer RNAs, the 5S ribosomal RNA and the U6 spliceosomal RNA, and is often deregulated in cancer cells. ...RNA polymerase (Pol) III transcribes essential non-coding RNAs, including the entire pool of transfer RNAs, the 5S ribosomal RNA and the U6 spliceosomal RNA, and is often deregulated in cancer cells. The initiation of gene transcription by Pol III requires the activity of the transcription factor TFIIIB to form a transcriptionally active Pol III preinitiation complex (PIC). Here we present electron microscopy reconstructions of Pol III PICs at 3.4-4.0 Å and a reconstruction of unbound apo-Pol III at 3.1 Å. TFIIIB fully encircles the DNA and restructures Pol III. In particular, binding of the TFIIIB subunit Bdp1 rearranges the Pol III-specific subunits C37 and C34, thereby promoting DNA opening. The unwound DNA directly contacts both sides of the Pol III cleft. Topologically, the Pol III PIC resembles the Pol II PIC, whereas the Pol I PIC is more divergent. The structures presented unravel the molecular mechanisms underlying the first steps of Pol III transcription and also the general conserved mechanisms of gene transcription initiation.